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Analog Devices Inc. LT1375CS8#TRPBF
- Part No.:
- LT1375CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1375CS8#TRPBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LT1375CS8#TRPBF from Analog Devices (formerly Linear Technology) is a 500kHz monolithic step-down switching regulator with integrated 1.5A NPN power switch, fixed 5V output, and current-mode control architecture. It delivers up to 1.25A at 5V from 6V–25V input, features 0.4Ω switch on-resistance, 2.5mA quiescent current, and cycle-by-cycle current limiting. It is used in battery-powered systems requiring compact, efficient DC/DC conversion.
For engineers reviewing the LT1375CS8#TRPBF datasheet, LT1375CS8#TRPBF pinout, LT1375CS8#TRPBF application, or LT1375CS8#TRPBF equivalent, key selection criteria include input voltage range (6V–25V), fixed 5V output tolerance (±1.2%), thermal performance in SO-8 package (θJA = 120–150°C/W), and synchronization capability (LT1375 only, 580–900kHz).
Technical Context
The LT1375CS8#TRPBF implements constant-frequency current-mode control using an internal 500kHz oscillator, error amplifier (2000 µMho transconductance), and peak-current comparator referenced to the VC pin. Its bipolar NPN switch is driven via BOOST pin voltage (≥VIN + 5V) to achieve saturation and low conduction loss.
It integrates undervoltage lockout (2.38V on SHDN), dual-threshold shutdown (0.4V full shutdown, 2.38V UVLO), and feedback-based foldback protection: frequency reduces below 1V FB voltage and current limit drops below 1.7V FB voltage-enabling robust short-circuit handling without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.2% (guaranteed over temperature and line) |
| Switch Current Limit | 1.5A at ≤50% duty cycle; derates to 1.35A at 80% duty cycle-defines max continuous load under worst-case VIN/VOUT ratios |
| Switch On Resistance | 0.4Ω typical (at ISW = 1.5A, VBOOST = VIN + 5V)-directly determines conduction loss and thermal rise |
| Quiescent Supply Current | 2.5mA typical (VIN = 15V, no load)-sets light-load efficiency floor and standby power budget |
| Shutdown Current | 20µA maximum (VSHDN = 0V, VIN ≤ 25V)-enables ultra-low-power system sleep modes |
| Switching Frequency | 500kHz ±10% (440–570kHz over full temperature range)-fixes minimum external inductor size (e.g., 5µH typical) |
| Input Voltage Range | 6V to 25V (minimum start-up VIN = 5.5V)-supports 2S–6S Li-ion, 5V rail boosting, and industrial 12/24V inputs |
Pinout & Package
LT1375CS8#TRPBF is housed in an 8-lead plastic SOIC (S8) package with exposed pad thermal enhancement. Pin 1 is marked by a beveled corner; pin numbering follows standard SOIC convention (counterclockwise from top-left). Thermal resistance θJA ranges from 120°C/W to 150°C/W depending on PCB copper area and layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST | Boost capacitor drive node | Supplies >VIN voltage to saturate internal NPN switch; requires external capacitor + diode (e.g., 10nF + 1N5818); missing boost causes ~1.5V switch drop and severe efficiency loss |
| VIN | Power input / switch collector | Connects to input source (6–25V); carries high di/dt during switching; must be bypassed locally with ≥10µF low-ESR capacitor |
| VSW | Switch emitter / inductor connection | Drives external inductor; swings negative during off-time (clamped by catch diode); trace inductance here directly increases VCE stress |
| BIAS | Not connected (NC) on LT1375 | No internal connection; must be left floating or tied to GND-unlike LT1376, LT1375 lacks BIAS functionality |
| VC | Error amplifier output / current limit threshold | Compensation node (typically RC network to GND); also serves as current clamp input; 0.9V = switch off threshold, 2.1V = high clamp |
| FB/SENSE | Feedback reference / 5V output sense | Internally connected to 5V output (fixed version); monitors output for regulation; <1.7V triggers current foldback, <1V triggers frequency foldback |
| GND | Power and signal reference | Must tie directly to low-impedance ground plane; shared GND paths cause load regulation error and EMI due to VSW-to-GND displacement current |
| SHDN | Enable/disable control | Logic-compatible input: <0.4V = full shutdown (20µA IQ), >2.38V = UVLO disable, >2.5V = normal operation |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode topology | Enables fast transient response and inherent cycle-by-cycle current limiting-no external current-sense resistor required |
| Integrated BOOST drive | Reduces switch saturation voltage to ~0.6V (vs. ~1.5V in non-boosted bipolar designs), improving efficiency to >87% at 1A |
| Programmable foldback protection | Automatically reduces switching frequency and current limit when FB voltage falls below 1V or 1.7V-limits power dissipation during short-circuit without external components |
| Synchronization capability | Accepts external 580–900kHz logic-level clock on SYNC pin (LT1375 only), enabling noise-sensitive system timing alignment |
| Thermal shutdown & short-circuit protection | Full-cycle current limiting and junction-temperature shutdown prevent damage during sustained overload or layout faults |
Applications
| Battery-Powered Portable Computer | Industrial Distributed Power Rail |
|---|---|
|
Use Scenario: Main 5V supply for embedded controller, USB peripherals, and display interface in handheld test equipment operating from 2S Li-ion (6–8.4V). IC Role / Device Role / Timing Role: Primary buck converter delivering regulated 5V at up to 1.25A; operates at fixed 500kHz to minimize inductor size and EMI filter footprint. Use Value: Enables compact design with 5µH inductor and eliminates need for external current-sense or sync circuitry-reducing BOM count by ≥3 components. |
Use Scenario: Local 5V rail generation in programmable logic controller (PLC) backplane, fed from 24V industrial bus with wide input transients. IC Role / Device Role / Timing Role: Point-of-load regulator providing stable 5V for FPGA I/O banks and communication PHYs; withstands 25V abs max input and includes UVLO for brownout immunity. Use Value: Delivers 87%+ efficiency at 1A while surviving 24V surges and maintaining regulation down to 6V input-eliminating need for upstream pre-regulator. |
| USB-C Power Delivery Sink | Medical Battery Charger Management |
|
Use Scenario: Secondary 5V rail in USB-C PD adapter, stepping down from variable PP voltage (5–20V) to power auxiliary MCU and sensors. IC Role / Device Role / Timing Role: Adjustable-input, fixed-output buck stage accepting wide VIN range; uses SHDN pin for dynamic enable/disable during PD negotiation phases. Use Value: Maintains tight 5V regulation across full USB-C PD input range without external feedback divider-reducing component count and layout sensitivity. |
Use Scenario: Charging circuit auxiliary supply in portable defibrillator, powering fuel gauging IC and status LEDs from main Li-ion pack (6–16V). IC Role / Device Role / Timing Role: Highly reliable 5V source with thermal shutdown and foldback protection-critical for safety-critical charging supervision functions. Use Value: Survives continuous short-circuit events (e.g., failed LED string) with <1W dissipation, preventing thermal runaway and ensuring system-level fault containment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3605EDE#TRPBF | 4MHz synchronous buck, 3A, 2.5V–5.5V input, integrated MOSFETs; smaller solution size but narrower input range | Requires ≥2.5V input; unsuitable for 6–25V industrial or battery systems; better for low-voltage portable apps | Select LTC3605EDE#TRPBF only if input stays within 2.5–5.5V and higher frequency (4MHz) is needed for ultra-small inductors. |
| LM2678SX-5.0/NOPB | 63kHz nonsynchronous buck, 5A, 8–40V input, external diode; lower efficiency (~78%) but higher current and wider VIN | Higher ripple, larger magnetics, and no foldback protection-requires external current limiting for short-circuit safety | Choose LM2678SX-5.0/NOPB when >1.5A load current or >25V input is required, and board space allows larger 63kHz magnetics. |
Compared with LTC3605EDE#TRPBF and LM2678SX-5.0/NOPB, LT1375CS8#TRPBF uniquely balances 500kHz switching, 6–25V input, integrated foldback, and SO-8 thermal performance-making it optimal for mid-power industrial and portable 5V rails where reliability and component count matter more than absolute peak current or ultra-high frequency.
Availability
LT1375CS8#TRPBF is available at Aetrix Electronics and suitable for battery-powered portable computers, industrial distributed power rails, USB-C power delivery sinks, and medical battery charger management systems requiring stable component supply and long-term manufacturability.
Supply support for LT1375CS8#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT1375CS8#TRPBF belongs to ADI's legacy Linear Technology monolithic switching regulator product line, designed specifically for compact, efficient, and robust DC/DC conversion in space-constrained industrial and portable applications.
FAQ
What is the maximum continuous output current of the LT1375CS8#TRPBF?
The LT1375CS8#TRPBF delivers up to 1.25A continuous output current at 5V when configured with appropriate external components (e.g., 10µH inductor, 100µF output capacitor) and operated within its 6V–25V input range. Peak switch current is rated at 1.5A ≤50% duty cycle, decreasing to 1.35A at 80% duty cycle-actual load current depends on VIN, inductor value, and thermal design.
Does the LT1375CS8#TRPBF require an external BOOST capacitor and diode?
Yes-the LT1375CS8#TRPBF requires an external BOOST capacitor (typically 10nF ceramic) and Schottky diode (e.g., 1N5818) connected between VIN and BOOST pins. This network generates a voltage >VIN to saturate the internal NPN switch; omitting it increases switch voltage drop to ~1.5V and degrades efficiency by >12 percentage points.
Can the LT1375CS8#TRPBF be synchronized to an external clock?
Yes-the LT1375CS8#TRPBF includes a dedicated SYNC pin that accepts logic-level input signals from 580kHz to 900kHz, allowing precise timing alignment with system clocks or other switching regulators to reduce beat frequencies and EMI. The LT1376 variant lacks this feature; synchronization is exclusive to the LT1375 family.
What protection features does the LT1375CS8#TRPBF include?
The LT1375CS8#TRPBF integrates cycle-by-cycle current limiting, thermal shutdown, undervoltage lockout (2.38V on SHDN), and dual-stage foldback protection: switching frequency reduces when FB voltage falls below 1V, and current limit decreases when FB drops below 1.7V-enabling safe operation during sustained short-circuit conditions without external components.
Is the LT1375CS8#TRPBF pin-compatible with the LT1376CS8#TRPBF?
No-the LT1375CS8#TRPBF and LT1376CS8#TRPBF are not pin-compatible. While both use the same SO-8 package, the LT1375 includes a SYNC pin (Pin 4), whereas the LT1376 substitutes a BIAS pin (Pin 4) for improved light-load efficiency. Swapping them requires PCB redesign and different external component networks.
LT1375CS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 5V
- Voltage - Input (Max):
- 25V
- Voltage - Output (Min/Fixed):
- 2.42V
- Voltage - Output (Max):
- 21.5V
- Current - Output:
- 1.5A (Switch)
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1375CS8#TRPBF FAQ
1.How can I place an order for LT1375CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1375CS8#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LT1375CS8#TRPBF reliable?
The price and inventory of LT1375CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1375CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1375CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1375CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1375CS8#TRPBF?
LT1375CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1375CS8#TRPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LT1375CS8#TRPBF?
For technical support, including LT1375CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1375CS8#TRPBF requirements.
6.How does Aetrix verify that LT1375CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1375CS8#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT1375CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1375CS8#TRPBF?
All LT1375CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1375CS8#TRPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LT1375CS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1375CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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